When Sera’s father is killed in a horrific accident, all he leaves behind is a mysterious key. Strange characters arrive in town including Angels, who claim to be sent for her protection. Sera falls hard for one of them but what if his promise of love is only a ruse to gain access to the key? Guided by clues left by her father, Sera searches for the hidden chamber beneath the city, hoping to save what lies within before the sinister mayor and his deadly followers drown humanity in a bloodbath.